1645503939403 has 2 divisors, whose sum is σ = 1645503939404. Its totient is φ = 1645503939402.

The previous prime is 1645503939301. The next prime is 1645503939407. The reversal of 1645503939403 is 3049393055461.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1645503939403 - 2²¹ = 1645501842251 is a prime.

It is not a weakly prime, because it can be changed into another prime (1645503939407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 822751969701 + 822751969702.

It is an arithmetic number, because the mean of its divisors is an integer number (822751969702).

Almost surely, 2^{1645503939403} is an apocalyptic number.

1645503939403 is a deficient number, since it is larger than the sum of its proper divisors (1).

1645503939403 is an equidigital number, since it uses as much as digits as its factorization.

1645503939403 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5248800, while the sum is 52.

The spelling of 1645503939403 in words is "one trillion, six hundred forty-five billion, five hundred three million, nine hundred thirty-nine thousand, four hundred three".